WO2015182408A1 - Sealing structure and sealing device - Google Patents
Sealing structure and sealing device Download PDFInfo
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- WO2015182408A1 WO2015182408A1 PCT/JP2015/064015 JP2015064015W WO2015182408A1 WO 2015182408 A1 WO2015182408 A1 WO 2015182408A1 JP 2015064015 W JP2015064015 W JP 2015064015W WO 2015182408 A1 WO2015182408 A1 WO 2015182408A1
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- ring
- sealing
- annular groove
- annular
- peripheral surface
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
- F16J15/104—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by structure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/062—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces characterised by the geometry of the seat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
- F16J15/102—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/166—Sealings between relatively-moving surfaces with means to prevent the extrusion of the packing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/46—Sealings with packing ring expanded or pressed into place by fluid pressure, e.g. inflatable packings
- F16J15/48—Sealings with packing ring expanded or pressed into place by fluid pressure, e.g. inflatable packings influenced by the pressure within the member to be sealed
Definitions
- the present invention relates to a sealing structure and a sealing device for sealing an annular gap between a shaft and a housing.
- FIG. 7 and 8 are schematic cross-sectional views of the sealing structure according to Conventional Example 1.
- FIG. 7 shows a state in which a differential pressure between the fluid pressures on both sides is not generated through the sealing device
- FIG. 8 shows a state in which a differential pressure between the fluid pressures on both sides is generated through the sealing device.
- the sealing device 500 plays a role of sealing an annular gap between the shaft 200 and the housing 300.
- the sealing device 500 is attached to an annular groove 210 formed on the outer peripheral surface of the shaft 200.
- the sealing device 500 includes an O-ring 510 made of a rubber-like elastic body and a backup ring 520 made of resin.
- the O-ring 510 is attached to the sealing target fluid side (A) of the annular groove 210, and the backup ring 520 is attached to the O-ring 510 of the annular groove 210 on the opposite side to the sealing target fluid side (A). Is done.
- opposite side (B) the side opposite to the fluid to be sealed (A) is referred to as “opposite side (B)”.
- the backup ring 520 protrudes outside the annular groove 210 of the O-ring 510. It plays a role to suppress.
- a tapered surface 211 that increases in diameter from the sealing target fluid side (A) toward the opposite side (B) is provided.
- the inner peripheral surface of the backup ring 520 is configured with a tapered surface 521 that is slidable with respect to the tapered surface 211 provided at the groove bottom of the annular groove 210.
- the backup ring 520 moves in the axial direction, so that the backup ring It is possible to suppress the formation of a gap between 520 and the tapered surface 211 and between the backup ring 520 and the inner peripheral surface of the shaft hole of the housing 300.
- the sealing performance can be stably maintained even under the condition that the shaft 200 is eccentric.
- FIG. 9 is a schematic cross-sectional view of a sealing structure according to Conventional Example 2.
- the sealing device 600 is also mounted in the annular groove 210 formed on the outer peripheral surface of the shaft 200.
- the sealing device 600 is also composed of a rubber-like elastic O-ring 610 and a resin backup ring 620.
- the O-ring 610 is mounted on the sealing target fluid side (A) of the annular groove 210, and the backup ring 620 is opposite to the sealing target fluid side (A) with respect to the O-ring 610 of the annular groove 210 (B). ).
- the end surface on the sealing target fluid side (A) of the backup ring 620 is configured to be a curved surface whose cross-sectional shape is an arc.
- the radius of curvature of the arc is designed to be approximately the same as the radius of the circle in the cross-sectional shape of the O-ring 610. Therefore, even if the O-ring 610 is brought into close contact with the backup ring 620 from a state away from the backup ring 620, the O-ring 610 does not deform so much. Therefore, as in the case of the above-described conventional example 1, the problem of O-ring wear due to periodic fluctuations in the fluid pressure hardly occurs.
- this sealing device 600 if the distance between the groove bottom of the annular groove 210 and the inner peripheral surface of the shaft hole of the housing 300 changes with the eccentricity of the shaft 200, the backup ring 620 and the groove bottom And a gap is formed between the backup ring 620 and the inner peripheral surface of the shaft hole of the housing 300. Therefore, a part of the O-ring 610 may be sandwiched between the backup ring 620 and the groove bottom or between the backup ring 620 and the inner peripheral surface of the shaft hole of the housing 300 and may be damaged.
- both the inner peripheral surface side and the outer peripheral surface side are configured with a pointed tip on the sealing target fluid side (A). Therefore, although this backup ring 620 can be obtained by molding, there is a problem that it is difficult to increase the dimensional accuracy.
- JP 11-315925 A Japanese Patent Laid-Open No. 11-72162 JP 2006-336835 A Japanese Utility Model Publication No. 64-24766 Japanese Utility Model Publication No.59-165984
- An object of the present invention is to provide a sealing structure and a sealing device capable of maintaining sealing performance against shaft eccentricity and maintaining the sealing performance for a long period even in an environment where fluid pressure fluctuates periodically. There is to do.
- the present invention employs the following means in order to solve the above problems.
- the sealing structure of the present invention is A shaft having an annular groove on the outer peripheral surface; A housing having a shaft hole through which the shaft is inserted; A sealing device mounted in the annular groove and sealing an annular gap between the shaft and the shaft hole;
- a sealing structure comprising: On the opposite side of the groove bottom of the annular groove from the sealing target fluid side, a tapered surface is provided that expands from the sealing target fluid side toward the opposite side,
- the sealing device includes: An O-ring made of a rubber-like elastic body attached to the sealed fluid side of the annular groove; A resin backup ring that is mounted on the opposite side to the O-ring of the annular groove and prevents the O-ring from protruding to the outside of the annular groove;
- the backup ring has an annular and plate-shaped body part, and an annular projecting part projecting toward the fluid to be sealed on the outer peripheral surface side of the body part,
- the inner peripheral surface of the body portion is configured with a tapered surface that is slidable within a
- the sealing device of the present invention comprises: In a sealing device that is mounted in an annular groove formed on an outer peripheral surface of a shaft and seals an annular gap between the shaft and a housing having a shaft hole through which the shaft is inserted.
- a tapered surface is provided that expands from the sealing target fluid side toward the opposite side,
- An O-ring made of a rubber-like elastic body attached to the sealed fluid side of the annular groove;
- a resin backup ring that is mounted on the opposite side to the O-ring of the annular groove and prevents the O-ring from protruding to the outside of the annular groove;
- the backup ring has an annular and plate-shaped body part, and an annular projecting part projecting toward the fluid to be sealed on the outer peripheral surface side of the body part,
- the inner peripheral surface of the body portion is configured with a tapered surface that is slidable within a range of the tapered surface with respect to the tapered surface provided at the groove bottom
- the tapered surface is provided with a diameter that increases from the sealing target fluid side toward the opposite side.
- drum part in a backup ring is comprised by the taper surface which can slide with respect to this taper surface. Accordingly, even if the distance between the groove bottom of the annular groove and the inner peripheral surface of the shaft hole of the housing changes due to the eccentricity of the shaft, the backup ring moves in the axial direction, so that the backup ring and the annular groove It is possible to suppress the formation of a gap between the taper surface at the groove bottom and between the backup ring and the shaft hole inner peripheral surface of the housing.
- the backup ring in the present invention has an annular protrusion that protrudes toward the sealing target fluid side on the outer peripheral surface side of the body portion, and the inner peripheral surface of the annular protrusion is directed toward the sealing target fluid side. It consists of an inclined surface that gradually expands in diameter. Therefore, when the O-ring comes into close contact with the backup ring due to fluid pressure, the outer peripheral portion of the O-ring opposite to the fluid to be sealed comes into close contact with the inclined surface of the annular protrusion.
- drum part in the backup ring in this invention is comprised by the taper surface slidable within the range of this taper surface with respect to the taper surface provided in the groove bottom of the annular groove. Therefore, when the O-ring comes into close contact with the backup ring due to fluid pressure, the inner peripheral portion of the O-ring opposite to the fluid to be sealed comes into close contact with the tapered surface provided at the groove bottom of the annular groove.
- FIG. 1 is a schematic cross-sectional view of a sealing device according to Embodiment 1 of the present invention.
- FIG. 2 is a schematic cross-sectional view of the sealing structure according to the first embodiment of the present invention.
- FIG. 3 is a schematic cross-sectional view of the sealing structure according to the first embodiment of the present invention.
- FIG. 4 is a schematic cross-sectional view of a sealing device according to Embodiment 2 of the present invention.
- FIG. 5 is a schematic cross-sectional view of a sealing device according to Embodiment 3 of the present invention.
- FIG. 6 is a schematic cross-sectional view of a sealing structure according to a reference example.
- FIG. 7 is a schematic cross-sectional view of a sealing structure according to Conventional Example 1.
- FIG. 8 is a schematic cross-sectional view of a sealing structure according to Conventional Example 1.
- FIG. 9 is a schematic cross-sectional view of a sealing structure according to Conventional Example 2.
- FIGS. 1 is a schematic cross-sectional view of a sealing device according to Embodiment 1 of the present invention.
- FIG. 1 is a cross-sectional view in which the O-ring 10 and the backup ring 20 constituting the sealing device 100 are partially broken.
- 2 and 3 are schematic cross-sectional views of the sealing structure according to Embodiment 1 of the present invention.
- FIG. 2 shows a state in which a differential pressure between the fluid pressures on both sides is not generated through the sealing device
- FIG. 3 shows a state in which a differential pressure between the fluid pressures on both sides is generated through the sealing device.
- the sealing device 100 includes an O-ring 10 made of a rubber-like elastic body and a backup ring 20 made of a resin.
- a material of the backup ring 20 in addition to hard resin materials such as nylon, polyphenylene sulfide (PPS), polyacetal (POM), polyamide (PA), polyether ether ketone (PEEK), polytetrafluoroethylene (PTFE), A soft resin material such as tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (PFA) may be employed.
- the sealing device 100 is mounted in an annular groove 210 formed on the outer peripheral surface of the shaft 200.
- the O-ring 10 is mounted on the sealing target fluid side (A) of the annular groove 210, and the backup ring 20 is opposite to the sealing target fluid side (A) with respect to the O-ring 10 of the annular groove 210. It is attached to.
- the backup ring 20 plays a role of suppressing the protrusion of the O-ring 10 to the outside of the annular groove 210.
- opposite side (B) the side opposite to the sealing target fluid side (A) is referred to as “opposite side (B)”.
- the backup ring 20 has an annular and plate-shaped body portion 21 and an annular projecting portion 23 that protrudes toward the sealing target fluid side (A) on the outer peripheral surface side of the body portion 21.
- both surfaces (surface on the opposite side (B) to the surface to be sealed fluid side (A)) of the body portion 21 are all flat surfaces.
- drum 21 is comprised by the taper surface 22.
- a tapered surface 211 is provided that increases in diameter from the sealing target fluid side (A) toward the opposite side (B).
- the tapered surface 22 which is the inner peripheral surface of the body portion 21 of the backup ring 20 is slidable within the range of the tapered surface 211 with respect to the tapered surface 211 provided at the groove bottom of the annular groove 210. It is configured. In other words, the tapered surface 22 which is the inner peripheral surface of the body portion 21 does not move to the sealing target fluid side (A) from the range where the tapered surface 211 in the annular groove 210 is provided. Thereby, when the O-ring 10 receives fluid pressure and comes into close contact with the backup ring 20, the inner peripheral portion on the opposite side (B) of the O-ring 10 is provided at the groove bottom of the annular groove 210. It comes into close contact with the tapered surface 211.
- the inner peripheral surface of the annular protrusion 23 in the backup ring 20 is configured with a tapered surface 24 as an inclined surface that gradually increases in diameter toward the fluid to be sealed (A).
- the sealing structure according to the present embodiment seals a shaft 200 having an annular groove 210 on the outer peripheral surface, a housing 300 having a shaft hole through which the shaft 200 is inserted, and an annular gap between the shaft 200 and the housing 300. And a sealing device 100. More specifically, the sealing device 100 is mounted in an annular groove 210 provided in the shaft 200 and seals an annular gap between the shaft 200 and a shaft hole provided in the housing 300.
- the O-ring 10 in the sealing device 100 is mounted on the sealing target fluid side (A) of the annular groove 210.
- the backup ring 20 is attached to the side (B) opposite to the fluid to be sealed (A) with respect to the O-ring 10 in the annular groove 210.
- the inner peripheral surface (tapered surface 22) of the body portion 21 of the backup ring 20 is slidable within the range of the tapered surface 211 with respect to the tapered surface 211 provided at the groove bottom of the annular groove 210. It is comprised so that it may become.
- the vicinity of the opposite end (B) of the O-ring 10 is in close contact with the sealing target fluid side (A) surface of the body portion 21 of the backup ring 20. Further, the inner peripheral portion on the opposite side (B) of the O-ring 10 is in close contact with the tapered surface 211 provided at the groove bottom of the annular groove 210. Further, the outer peripheral portion on the opposite side (B) of the O-ring 10 is in close contact with the inner peripheral surface (tapered surface 24) of the annular protrusion 23 in the backup ring 20.
- the inner peripheral surface (tapered surface 22) of the body portion 21 in the backup ring 20 is a tapered surface provided at the groove bottom of the annular groove 210.
- 211 is configured to be slidable with respect to 211.
- the sealing structure and the sealing device 100 according to the present embodiment the sealing performance can be stably maintained even under the condition that the shaft 200 is eccentric.
- the inner peripheral portion of the opposite side (B) in the O-ring 10 is an annular groove.
- the outer peripheral portion on the opposite side (B) of the O-ring 10 is in close contact with the inner peripheral surface (tapered surface 24) of the annular protrusion 23 in the backup ring 20.
- the sealing device 100 even when the sealing device 100 is used in an environment where the fluid pressure fluctuates periodically, such as a pipe of an injector, it is possible to suppress the O-ring 10 from being worn. Therefore, according to the sealing structure and the sealing device 100 according to the present embodiment, the sealing performance can be maintained over a long period even in an environment where the fluid pressure fluctuates periodically.
- the body portion 21 of the backup ring 20 is more excellent in eccentricity following property as it is thinner.
- the annular protrusion 23 in the backup ring 20 can reduce the deformation amount of the O-ring 10 as the protrusion amount increases.
- the maximum thickness of the portion of the backup ring 20 where the annular protrusion 23 is provided may be set in the range of 1.5 mm to 3.0 mm, for example.
- the annular protrusion 23 is less likely to be deformed as the wall thickness is increased, and part of the outer peripheral surface side of the backup ring 20 is prevented from protruding outside the annular groove 210. Therefore, when a soft resin material that is easily deformed as compared with a hard resin material is applied as the material of the backup ring 20, it is effective to increase the thickness of the annular protrusion 23.
- FIG. 4 shows a second embodiment of the present invention.
- the configuration of the backup ring is different from that of the first embodiment will be described. Since the basic configuration and operation are the same as those in the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.
- FIG. 4 is a schematic cross-sectional view of a sealing device according to Embodiment 2 of the present invention.
- the sealing device 100 according to this embodiment is also composed of a rubber-like elastic O-ring 10 and a resin backup ring 20 as in the case of the first embodiment. Since the O-ring 10 has the same configuration as that of the O-ring 10 according to the first embodiment, the description thereof is omitted. The materials applicable to the backup ring 20 according to this embodiment are also as described in the first embodiment.
- the backup ring 20 also has an annular and plate-shaped body portion 21 and an annular protrusion that protrudes toward the fluid to be sealed on the outer peripheral surface side of the body portion 21. 23.
- drum 21 is comprised by the taper surface 22.
- the inner peripheral surface of the annular protrusion 23 in the backup ring 20 according to the present embodiment is configured with a tapered surface 24 as an inclined surface that gradually increases in diameter toward the fluid to be sealed.
- the planar portion of the body portion 21 on the fluid to be sealed side and the inner peripheral surface (tapered surface 24) of the annular projecting portion 23 are connected by the curved surface 25.
- the curved surface 25 has been.
- the planar portion on the sealing target fluid side in the body portion 21 and the inner peripheral surface (tapered surface) of the annular projecting portion 23 It is feared that cracks are likely to occur at the intersection with 24).
- the planar portion of the body portion 21 on the fluid side to be sealed and the inner peripheral surface (tapered surface 24) of the annular projecting portion 23 are connected by the curved surface 25.
- the occurrence of cracks can be suppressed.
- sealing structure is the same as the sealing structure in Example 1, the description thereof is omitted.
- the same effect as in the case of the first embodiment can be obtained.
- the planar portion on the sealing target fluid side in the body portion 21 and the inner peripheral surface (tapered) of the annular protrusion 23 can be adopted as the material of the backup ring 20.
- FIG. 5 shows a third embodiment of the present invention.
- the configuration of the backup ring is different from that of the first embodiment will be described. Since the basic configuration and operation are the same as those in the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.
- FIG. 5 is a schematic cross-sectional view of a sealing device according to Embodiment 3 of the present invention.
- the sealing device 100 according to this embodiment is also composed of a rubber-like elastic O-ring 10 and a resin backup ring 20 as in the case of the first embodiment. Since the O-ring 10 has the same configuration as that of the O-ring 10 according to the first embodiment, the description thereof is omitted. The materials applicable to the backup ring 20 according to this embodiment are also as described in the first embodiment.
- the backup ring 20 also has an annular and plate-shaped body portion 21 and an annular protrusion that protrudes toward the fluid to be sealed on the outer peripheral surface side of the body portion 21. 23. And the inner peripheral surface of the trunk
- the inner peripheral surface of the annular projecting portion 23 is not a tapered surface but an inclined surface (curved surface 26) having a circular cross section.
- the only difference from the backup ring 20 according to the first embodiment is that the inner peripheral surface of the annular protrusion 23 is not a tapered surface but is formed by a curved surface 26.
- the curved surface 26 is smoothly connected to a planar portion on the sealing target fluid side in the body portion 21.
- sealing structure is the same as the sealing structure in Example 1, the description thereof is omitted.
- the same effect as in the case of the first embodiment can be obtained.
- the curved surface 26 that is the inner peripheral surface of the annular projecting portion 23 is smoothly connected to the planar portion of the body portion 21 on the fluid to be sealed side. The same effect can be obtained.
- FIG. 6 is a schematic cross-sectional view of a sealing structure according to a reference example.
- FIG. 6 shows a state in which a differential pressure between the fluid pressures on both sides is not generated via the sealing device.
- the sealing device 400 according to this reference example is also composed of a rubber-like elastic O-ring 410 and a resin backup ring 420 as in the case of the first embodiment.
- the O ring 410 has the same configuration as the O ring 10 according to the first embodiment.
- the materials applicable to the backup ring 420 according to this reference example are also as described in the first embodiment.
- the backup ring 420 includes an annular body portion 421.
- annular body portion 421 About the point by which the internal peripheral surface of this trunk
- annular projecting portions 423 and 424 that project toward the sealing target fluid side (A) are provided on the outer peripheral surface side and the inner peripheral surface side of the body portion 421, respectively.
- an annular protrusion 424 is also provided on the inner peripheral surface side of the backup ring 420.
- the backup ring 420 is less likely to slide in the axial direction compared to the above embodiments, for example, because the annular protrusion 424 is pressed radially inward by the O-ring 410. Therefore, it is inferior to the sealing device 100 according to each of the above embodiments in terms of eccentric followability.
- both the inner peripheral surface side and the outer peripheral surface side are configured with a pointed tip on the sealing target fluid side (A). Therefore, the backup ring 420 can be obtained by molding, but there is a problem that it is difficult to increase the dimensional accuracy.
- the inner peripheral surface of the body portion 421 is configured by the tapered surface 422, in order to mold the backup ring 420 so that there is no undercut portion, the mold is configured to open in the axial direction. Thus, the parting surface must pass through the tip of the annular protrusion 424. In the case of the mold configured as described above, when the mold is opened, the backup ring 420 is buried in one mold, so that there is a problem that the releasability is inferior.
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Abstract
Description
外周面に環状溝を有する軸と、
該軸が挿通される軸孔を有するハウジングと、
前記環状溝に装着され、前記軸と軸孔との間の環状隙間を密封する密封装置と、
を備える密封構造において、
前記環状溝の溝底における密封対象流体側とは反対側には、密封対象流体側から該反対側に向かうにつれて拡径するテーパ面が設けられており、
前記密封装置は、
前記環状溝のうち密封対象流体側に装着されるゴム状弾性体製のOリングと、
前記環状溝のうち前記Oリングに対して前記反対側に装着され、該Oリングの前記環状溝の外側へのはみ出しを抑制する樹脂製のバックアップリングと、を備えると共に、
前記バックアップリングは、環状かつ板状の胴体部と、該胴体部の外周面側で密封対象流体側に向かって突出する環状突出部と、を有しており、
前記胴体部の内周面は、前記環状溝の溝底に設けられたテーパ面に対して、このテーパ面の範囲内で摺動自在なテーパ面で構成されており、
前記環状突出部の内周面は密封対象流体側に向かって徐々に拡径する傾斜面で構成されていることを特徴とする。 That is, the sealing structure of the present invention is
A shaft having an annular groove on the outer peripheral surface;
A housing having a shaft hole through which the shaft is inserted;
A sealing device mounted in the annular groove and sealing an annular gap between the shaft and the shaft hole;
In a sealing structure comprising:
On the opposite side of the groove bottom of the annular groove from the sealing target fluid side, a tapered surface is provided that expands from the sealing target fluid side toward the opposite side,
The sealing device includes:
An O-ring made of a rubber-like elastic body attached to the sealed fluid side of the annular groove;
A resin backup ring that is mounted on the opposite side to the O-ring of the annular groove and prevents the O-ring from protruding to the outside of the annular groove;
The backup ring has an annular and plate-shaped body part, and an annular projecting part projecting toward the fluid to be sealed on the outer peripheral surface side of the body part,
The inner peripheral surface of the body portion is configured with a tapered surface that is slidable within a range of the tapered surface with respect to the tapered surface provided at the groove bottom of the annular groove,
The inner peripheral surface of the annular protrusion is formed by an inclined surface that gradually increases in diameter toward the fluid to be sealed.
軸の外周面に形成された環状溝に装着され、前記軸と該軸が挿通される軸孔を有するハウジングとの間の環状隙間を密封する密封装置において、
前記環状溝の溝底における密封対象流体側とは反対側には、密封対象流体側から該反対側に向かうにつれて拡径するテーパ面が設けられており、
前記環状溝のうち密封対象流体側に装着されるゴム状弾性体製のOリングと、
前記環状溝のうち前記Oリングに対して前記反対側に装着され、該Oリングの前記環状溝の外側へのはみ出しを抑制する樹脂製のバックアップリングと、を備えると共に、
前記バックアップリングは、環状かつ板状の胴体部と、該胴体部の外周面側で密封対象流体側に向かって突出する環状突出部と、を有しており、
前記胴体部の内周面は、前記環状溝の溝底に設けられたテーパ面に対して、このテーパ面の範囲内で摺動自在なテーパ面で構成されており、
前記環状突出部の内周面は密封対象流体側に向かって徐々に拡径する傾斜面で構成されていることを特徴とする。 Moreover, the sealing device of the present invention comprises:
In a sealing device that is mounted in an annular groove formed on an outer peripheral surface of a shaft and seals an annular gap between the shaft and a housing having a shaft hole through which the shaft is inserted.
On the opposite side of the groove bottom of the annular groove from the sealing target fluid side, a tapered surface is provided that expands from the sealing target fluid side toward the opposite side,
An O-ring made of a rubber-like elastic body attached to the sealed fluid side of the annular groove;
A resin backup ring that is mounted on the opposite side to the O-ring of the annular groove and prevents the O-ring from protruding to the outside of the annular groove;
The backup ring has an annular and plate-shaped body part, and an annular projecting part projecting toward the fluid to be sealed on the outer peripheral surface side of the body part,
The inner peripheral surface of the body portion is configured with a tapered surface that is slidable within a range of the tapered surface with respect to the tapered surface provided at the groove bottom of the annular groove,
The inner peripheral surface of the annular protrusion is formed by an inclined surface that gradually increases in diameter toward the fluid to be sealed.
図1~図3を参照して、本発明の実施例1に係る密封装置及び密封構造について説明する。図1は本発明の実施例1に係る密封装置の模式的断面図である。なお、図1においては、密封装置100を構成するOリング10とバックアップリング20について、それぞれ一部を破断した断面図を示している。図2及び図3は本発明の実施例1に係る密封構造の模式的断面図である。なお、図2は密封装置を介して両側の流体圧力の差圧が生じていない状態を示し、図3は密封装置を介して両側の流体圧力の差圧が生じている状態を示している。 Example 1
A sealing device and a sealing structure according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 is a schematic cross-sectional view of a sealing device according to Embodiment 1 of the present invention. FIG. 1 is a cross-sectional view in which the O-
密封装置100の構成について説明する。本実施例に係る密封装置100は、ゴム状弾性体製のOリング10と樹脂製のバックアップリング20とから構成される。バックアップリング20の材料としては、ナイロン,ポリフェニレンサルファイド(PPS),ポリアセタール(POM),ポリアミド(PA),ポリエーテルエーテルケトン(PEEK)などの硬質の樹脂材の他、ポリテトラフルオロエチレン(PTFE),テトラフルオロエチレン・パーフルオロアルキルビニルエーテル共重合体(PFA)などの軟質の樹脂材を採用し得る。 <Sealing device>
The configuration of the
本実施例に係る密封構造について説明する。本実施例に係る密封構造は、外周面に環状溝210を有する軸200と、この軸200が挿通される軸孔を有するハウジング300と、これら軸200とハウジング300との間の環状隙間を密封する密封装置100とから構成される。より具体的には、密封装置100は、軸200に設けられた環状溝210に装着され、軸200とハウジング300に設けられた軸孔との間の環状隙間を密封する。 <Sealing structure>
The sealing structure according to the present embodiment will be described. The sealing structure according to the present embodiment seals a
以上のように、本実施例に係る密封構造及び密封装置100によれば、バックアップリング20における胴体部21の内周面(テーパ面22)が、環状溝210の溝底に設けられたテーパ面211に対して摺動自在となるように構成される。これにより、軸200の偏心に伴い、環状溝210の溝底とハウジング300の軸孔内周面との間の距離が変化しても、バックアップリング20が軸線方向に移動することで、バックアップリング20とテーパ面211との間、及びバックアップリング20とハウジング300の軸孔内周面との間に隙間が形成されてしまうことを抑制することができる。従って、Oリング10の一部が、バックアップリング20と溝底との間、又はバックアップリング20とハウジング300の軸孔内周面との間に挟み込まれて破損してしまうことを抑制できる。このように、本実施例に係る密封構造及び密封装置100によれば、軸200が偏心してしまう条件下でも、安定的に密封性を維持することができる。 <Excellent points of sealing structure and sealing device according to this embodiment>
As described above, according to the sealing structure and the
図4には、本発明の実施例2が示されている。本実施例においては、バックアップリングの構成が、上記実施例1とは異なる場合について説明する。基本的な構成および作用については実施例1と同一なので、同一の構成部分については同一の符号を付して、その説明は省略する。図4は本発明の実施例2に係る密封装置の模式的断面図である。 (Example 2)
FIG. 4 shows a second embodiment of the present invention. In the present embodiment, a case where the configuration of the backup ring is different from that of the first embodiment will be described. Since the basic configuration and operation are the same as those in the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted. FIG. 4 is a schematic cross-sectional view of a sealing device according to Embodiment 2 of the present invention.
図5には、本発明の実施例3が示されている。本実施例においては、バックアップリングの構成が、上記実施例1とは異なる場合について説明する。基本的な構成および作用については実施例1と同一なので、同一の構成部分については同一の符号を付して、その説明は省略する。図5は本発明の実施例3に係る密封装置の模式的断面図である。 Example 3
FIG. 5 shows a third embodiment of the present invention. In the present embodiment, a case where the configuration of the backup ring is different from that of the first embodiment will be described. Since the basic configuration and operation are the same as those in the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted. FIG. 5 is a schematic cross-sectional view of a sealing device according to Embodiment 3 of the present invention.
図6を参照して、参考例に係る密封装置及び密封構造について説明する。図6は参考例に係る密封構造の模式的断面図である。なお、図6は密封装置を介して両側の流体圧力の差圧が生じていない状態を示している。 (Reference example)
With reference to FIG. 6, the sealing apparatus and sealing structure which concern on a reference example are demonstrated. FIG. 6 is a schematic cross-sectional view of a sealing structure according to a reference example. FIG. 6 shows a state in which a differential pressure between the fluid pressures on both sides is not generated via the sealing device.
20 バックアップリング
21 胴体部
22 テーパ面
23 環状突出部
24 テーパ面
25 湾曲面
26 湾曲面
100 密封装置
200 軸
210 環状溝
211 テーパ面
300 ハウジング DESCRIPTION OF SYMBOLS 10 O-
Claims (2)
- 外周面に環状溝を有する軸と、
該軸が挿通される軸孔を有するハウジングと、
前記環状溝に装着され、前記軸と軸孔との間の環状隙間を密封する密封装置と、
を備える密封構造において、
前記環状溝の溝底における密封対象流体側とは反対側には、密封対象流体側から該反対側に向かうにつれて拡径するテーパ面が設けられており、
前記密封装置は、
前記環状溝のうち密封対象流体側に装着されるゴム状弾性体製のOリングと、
前記環状溝のうち前記Oリングに対して前記反対側に装着され、該Oリングの前記環状溝の外側へのはみ出しを抑制する樹脂製のバックアップリングと、を備えると共に、
前記バックアップリングは、環状かつ板状の胴体部と、該胴体部の外周面側で密封対象流体側に向かって突出する環状突出部と、を有しており、
前記胴体部の内周面は、前記環状溝の溝底に設けられたテーパ面に対して、このテーパ面の範囲内で摺動自在なテーパ面で構成されており、
前記環状突出部の内周面は密封対象流体側に向かって徐々に拡径する傾斜面で構成されていることを特徴とする密封構造。 A shaft having an annular groove on the outer peripheral surface;
A housing having a shaft hole through which the shaft is inserted;
A sealing device mounted in the annular groove and sealing an annular gap between the shaft and the shaft hole;
In a sealing structure comprising:
On the opposite side of the groove bottom of the annular groove from the sealing target fluid side, a tapered surface is provided that expands from the sealing target fluid side toward the opposite side,
The sealing device includes:
An O-ring made of a rubber-like elastic body attached to the sealed fluid side of the annular groove;
A resin backup ring that is mounted on the opposite side to the O-ring of the annular groove and prevents the O-ring from protruding to the outside of the annular groove;
The backup ring has an annular and plate-shaped body part, and an annular projecting part projecting toward the fluid to be sealed on the outer peripheral surface side of the body part,
The inner peripheral surface of the body portion is configured with a tapered surface that is slidable within a range of the tapered surface with respect to the tapered surface provided at the groove bottom of the annular groove,
The sealing structure characterized in that the inner peripheral surface of the annular projecting portion is formed of an inclined surface that gradually increases in diameter toward the fluid to be sealed. - 軸の外周面に形成された環状溝に装着され、前記軸と該軸が挿通される軸孔を有するハウジングとの間の環状隙間を密封する密封装置において、
前記環状溝の溝底における密封対象流体側とは反対側には、密封対象流体側から該反対側に向かうにつれて拡径するテーパ面が設けられており、
前記環状溝のうち密封対象流体側に装着されるゴム状弾性体製のOリングと、
前記環状溝のうち前記Oリングに対して前記反対側に装着され、該Oリングの前記環状溝の外側へのはみ出しを抑制する樹脂製のバックアップリングと、を備えると共に、
前記バックアップリングは、環状かつ板状の胴体部と、該胴体部の外周面側で密封対象流体側に向かって突出する環状突出部と、を有しており、
前記胴体部の内周面は、前記環状溝の溝底に設けられたテーパ面に対して、このテーパ面の範囲内で摺動自在なテーパ面で構成されており、
前記環状突出部の内周面は密封対象流体側に向かって徐々に拡径する傾斜面で構成されていることを特徴とする密封装置。 In a sealing device that is mounted in an annular groove formed on an outer peripheral surface of a shaft and seals an annular gap between the shaft and a housing having a shaft hole through which the shaft is inserted.
On the opposite side of the groove bottom of the annular groove from the sealing target fluid side, a tapered surface is provided that expands from the sealing target fluid side toward the opposite side,
An O-ring made of a rubber-like elastic body attached to the sealed fluid side of the annular groove;
A resin backup ring that is mounted on the opposite side to the O-ring of the annular groove and prevents the O-ring from protruding to the outside of the annular groove;
The backup ring has an annular and plate-shaped body part, and an annular projecting part projecting toward the fluid to be sealed on the outer peripheral surface side of the body part,
The inner peripheral surface of the body portion is configured with a tapered surface that is slidable within a range of the tapered surface with respect to the tapered surface provided at the groove bottom of the annular groove,
The sealing device according to claim 1, wherein an inner peripheral surface of the annular projecting portion is formed of an inclined surface that gradually increases in diameter toward the fluid to be sealed.
Priority Applications (4)
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EP15800386.3A EP3150885A4 (en) | 2014-05-29 | 2015-05-15 | Sealing structure and sealing device |
US15/314,432 US20170211703A1 (en) | 2014-05-29 | 2015-05-15 | Sealing structure and sealing device |
JP2015563006A JP5939367B2 (en) | 2014-05-29 | 2015-05-15 | Sealing structure and sealing device |
CN201580004348.0A CN105899858B (en) | 2014-05-29 | 2015-05-15 | Sealing structure and sealing device |
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EP (1) | EP3150885A4 (en) |
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JP7243978B2 (en) * | 2019-01-23 | 2023-03-22 | 株式会社荒井製作所 | sealing device |
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US20170211703A1 (en) | 2017-07-27 |
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